Comparison
Steam Tunnel vs Heat Tunnel (Shrink Sleeves)
Both systems can work. The better question is: which one gives you a controlled, repeatable shrink profile for your film and container shape?
Steam tunnels (typical strengths)
- Often more even shrink across complex shapes
- Can be more forgiving on tough geometries
- Often preferred when you want controlled, consistent results
Heat tunnels (typical strengths)
- Can be simpler depending on setup
- Can work well on certain films and shapes
- Still requires careful tuning to avoid distortion or scorching
What actually decides it
- Film type and thickness
- Container shape (especially taper/curves)
- Where the seam lands
- How much cosmetic perfection you need
Best next step
If shrink sleeves are the correct method for your shape, review an example of a purpose-built steam tunnel system: Zap Labeler steam tunnel shrink sleeve systems.
FAQ
- Do steam tunnels always beat heat tunnels? No. But steam often wins on evenness for challenging shapes.
- What causes sleeve scorching? Usually too much heat concentration or mismatched film/settings.